<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
</head>
<body>

<div id="app"> 
  <!-- 1.直接拼接：语法过于繁琐 -->
  <h2>{{firstName}} {{lastName}}</h2>
  <!-- 2.通过定义methods -->
  <h2>{{getFullName()}}</h2>
  <h2>{{getFullName()}}</h2>
  <h2>{{getFullName()}}</h2>
  <h2>{{getFullName()}}</h2>
  <!-- 3.通过computed -->
  <h2>{{fullName}}</h2>
  <h2>{{fullName}}</h2>
  <h2>{{fullName}}</h2>
  <h2>{{fullName}}</h2>
</div>
  
<script src="../js/vue.js"></script>
<script>
  //angular -> google
  //TypeScript(microsoft) -> ts(类型检测)
  //flow(facebook)
  const app = new Vue({
    el: '#app',//用于挂载要管理的元素
    data: {
      firstName: 'Kobe',
      lastName: 'Bryant'
    },
    methods: {
      getFullName() {
        console.log('getFullName')
        return this.firstName + ' ' + this.lastName
      }
    },
    computed: {
      fullName: function () {//性能低，内部有缓存，不会频繁调用，数据发送变动时才会重新调用
        console.log('fullName')
        return this.firstName + ' ' + this.lastName
      }
    }
  })
</script>

</body>
</html>